I can explain it to you:
Childhood gender non-conformity, as in playing with the “wrong” toys for your sex (boys wanting to play with dolls, girls wanting to play with trucks) or wanting to dress in clothing traditionally associated with the opposite sex (boys wanting princess dresses, etc) is statistically predictive of a future same-sex attraction - that is, of growing up to be gay or lesbian.
However, in the last 15 years the “affirmation only” model of healthcare came into being - in this model, a child who expresses themselves in ways traditionally associated with the opposite sex, will be told that they are in fact the opposite sex (that they were “born in the wrong body”) and all attention will be focused on encouraging that child not only to identify as the opposite sex, but to go down a path that includes removing primary and secondary sex organs and inducing endocrine disorders by taking cross-sex hormones.
If you look at the first piece of information - most gender non-conforming kids will grow up gay or lesbian - and the second piece of information - today’s gender non-conforming kids are told that they are straight, but in the wrong body - you can see that many gays and lesbians believe that trans ideology is erasing homosexuality.